Table 2. Norrish–Yang Cyclization for the Stereoselective Synthesis of Products 6a–6d and 7a–7ea.
Reaction conditions: substrates (0.05 mmol) dissolved in CHCl3 were irradiated under a daylight lamp (65 W) at 30 °C for 10 h. The distance between the reaction flask and the light source was ca. 4–5 cm.